change shell for disable feature in csit

there is no bash in container
hence need to change to sh

Issue-ID: POLICY-2895
Change-Id: I5b5ffb028e478a93e09e9ed6926c6478da15e0ef
Signed-off-by: Taka Cho <takamune.cho@att.com>
diff --git a/csit/config/drools-apps/custom/features.pre.sh b/csit/config/drools-apps/custom/features.pre.sh
index e9c77a0..fd7b5b9 100755
--- a/csit/config/drools-apps/custom/features.pre.sh
+++ b/csit/config/drools-apps/custom/features.pre.sh
@@ -1,4 +1,4 @@
-#!/bin/bash -x
+#!/bin/sh
 # ============LICENSE_START===================================================
 # Copyright (C) 2020 AT&T Intellectual Property. All rights reserved.
 # ============================================================================
@@ -15,4 +15,4 @@
 # limitations under the License.
 # ============LICENSE_END=====================================================
 
-bash -c "features disable distributed-locking"
+sh -c "features disable distributed-locking"